$BE/190: Tape Input/Output Block count
Used by Jiffy-DOS: DRVBYT
Used only from Basic for Jiffy-DOS wedge comands, device
toggle and function keys.
Kernal-Reference:
DEC $BE : $FC57
LDA $BE : $FA6A $FC84
LDX $BE : $FA7A $FB55 $FC24
STA $BE : $F8A6 $FB64
STX $BE : $FB5A
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